Windows (and soon, OS X): Steam, the awesome online video game store and library program, released a new beta yesterday featuring Big Picture, a full screen interface designed for media centers.

We've built a few media centers that can play modern video games, but Steam just released an update that makes Steam the perfect media center companion. Big Picture not only makes your games easy to navigate and start, but its completely controller-friendly, so you can control it without a keyboard. Heck, it even has an awesome keyboard designed to work with gamepads, not to mention a gamepad-friendly web browser. Check out the video above to see it in action, or see Kotaku's full review to see a closer look at what's inside.

Today, Valve will launch the beta of Big Picture mode, a version of Steam designed for your…
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To get Big Picture, just open up Steam and go to Steam > Settings. Under "Beta Participation", click "Change", and choose Steam Beta Update from the dropdown. After restarting, Steam should stay updated to the latest beta. You can then launch Big Picture from the top right corner.